Monthly Historical AveragesPort Isabel, TX
Average Temperature
High
21°
Feels 21
Low
15°
Feels 14
Average Precipitation
5 Days
29.5mm
0cm
Content continues below
Daily Historical Averages
S
M
T
W
T
F
S
ForecastWednesday, December 31, 2025
Day
18°Feels 18
Wind
12 km/h NW
Gust
18 km/h
Humidity
46%
P.O.P
20%
Night
16°Feels 16
Wind
12 km/h S
Gust
18 km/h
Humidity
84%
P.O.P
20%
Historical AveragesDec 31
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity